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LM3409MY/NOPB

TILM3409MY/NOPB

Texas Instruments
A widely used LED driver IC from TI to consider when comparing LED driver architectures and performance.
NRND16,197 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LM3409MY/NOPB is a P-channel MOSFET controller designed for step-down (buck) LED driving applications. It utilizes a constant off-time control architecture that requires no external control loop compensation, making it simple to implement while maintaining high-speed operation. The device supports a wide input voltage range from 6V to 42V and features high-side differential current sensing.

Why Choose This Part

The LM3409 simplifies design by eliminating the need for complex control loop compensation while supporting all-ceramic output capacitors. Its high-side current sensing allows the LED cathode to be connected directly to the chassis ground, simplifying thermal management. Additionally, it offers a high contrast ratio for PWM dimming, reaching up to 10,000:1.

Applications

High-Brightness LED Driving
Precise current regulation for high-power LED strings in commercial or architectural lighting.
Industrial Lighting Systems
Reliable buck regulation for industrial-grade light fixtures requiring high thermal stability up to 125 degrees Celsius.
PWM and Analog Dimming
Applications requiring deep dimming ranges, supporting 10,000:1 PWM and 250:1 analog dimming ratios.
Capacitor-less LED Drivers
Systems designed without output capacitors to minimize board space and cost while improving transient response.

Key Specifications

Type DC DC Controller
Dimming Analog, PWM
Topology Step-Down (Buck)
Mounting Type Surface Mount
Package / Case 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
Number of Outputs 1
Internal Switch(s) No
Operating Temperature -40degC ~ 125degC (TJ)
Voltage - Supply (Max) 42V
Voltage - Supply (Min) 6V
Supplier Device Package 10-HVSSOP

Getting Started

Engineers can evaluate performance using the LM3409EVAL evaluation board, which demonstrates a typical buck configuration. When designing the PCB, ensure the P-channel MOSFET and catch diode are placed close to the IC to minimize switching loops, and refer to the datasheet for calculating the constant off-time resistor value.

LM3409 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Voltage - Supply (Max) Stock
LM3409MY/NOPB (this part) 42V 16,197
LM3409HVMYX/NOPB 75V 16,759
LM3409HVMY/NOPB 75V 28,651

Categories

Displays & Optoelectronics > LED Drivers Consumer Electronics > LED & Lighting Control